32 in underbust, 36 in bust
- Band
- 32
- Cup
- D
- Bust minus band
- 4 in
Bra sizing varies a lot by brand, body shape, and style. Treat this as a fitting starting point.
Bra Size Calculator
Use this free bra size calculator to estimate a US-style starting bra size from underbust and bust measurements in inches.
Inputs explainedResult checksExample valuesRuns in your browser
Formula steps
- Round the underbust up to the next even band size.
- Subtract the band size from the bust measurement.
- Map that difference to an approximate cup label.
Examples
Recent answers
Recent bra size estimates will appear here.
Measurements stay in this browser tab. Fit varies by brand and style.
Inputs and recent answers stay in this browser tab and are not sent to a server.
How to use the Bra Size Calculator
- Enter underbust and bust measurements in inches.
- Press Estimate bra size to see a starting US-style band and cup estimate.
- Use the result only as a fitting starting point because brand charts and styles vary.
- Try nearby sister sizes when the band or cup fit feels off.
What people use it for
Get a quick starting size before checking brand charts.
Understand the difference between band size and cup difference.
Compare nearby sizes before trying bras on.
Avoid treating a single measurement as a final fit answer.
Quick examples
Simple estimate
32 in underbust, 36 in bustAbout 32D
Rounded band
33 in underbust, 36 in bustAbout 34B
Cup difference
34 in underbust, 39 in bustAbout 34DD/E
Need the guide or a nearby tool?
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
- How to use the Bra Size CalculatorSee slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
- Everyday ToolsBrowse related calculators and utilities in the same category.
- Calculator and utility guidesFind more guides that use real tool inputs and example numbers.
- All free toolsSearch every live tool, converter, calculator, AI helper, and browser utility.
Frequently asked questions
Plain-language answers about when to use the tool, what it does with your inputs, what to double-check, and how privacy works.
When should I use the Bra Size Calculator?
Use it when your task matches one of these common needs: Get a quick starting size before checking brand charts. Understand the difference between band size and cup difference. It works best when you already know a snug underbust measurement and a full-bust measurement in inches.
What is the Bra Size Calculator doing with my inputs?
In plain language: The calculator rounds underbust up to an even band size, subtracts band size from bust size, and maps the difference to an approximate cup label. The examples on the page are there so you can compare your inputs with a US-style bra-size example before copying the answer.
What do the main Bra Size Calculator inputs mean?
Underbust inches: the snug measurement around the rib cage directly under the bust. Bust inches: the measurement around the fullest part of the bust with the tape level and not pulled tight. Band: the even-numbered band size after the underbust measurement is rounded up. Cup: the approximate cup label from bust minus band size, using a simple US-style mapping.
How should I read the Bra Size Calculator answer?
Read the headline answer, then check the smaller lines beside it. For everyday tools, those lines usually show the distance, time, cost, units, or setting that made the answer change.
What should I double-check before trusting the answer?
Bra sizing varies by brand, body shape, country, and style. Use this as a fitting starting point, not a guaranteed size. Measure with a soft tape, keep the tape level, breathe normally, and compare the answer with the size chart for the exact brand or style you plan to try.
Why did my band size round up?
The page uses even-numbered US-style band sizes. For example, a 33 inch underbust rounds up to a 34 band before the cup difference is calculated.
What if the estimate is close but not comfortable?
Try nearby sizes and sister sizes instead of treating one answer as final. For example, a 32D and 34C can feel related in cup volume, but band tension, strap placement, wire shape, and brand cut can change the fit.
Does this work for every country or brand?
No. This is a US-style starting estimate. UK, EU, AU, and brand-specific systems can label cups and bands differently, so check the brand chart before buying.
Does the site save what I enter?
No. The calculator runs in your browser tab. Your measurements and recent estimates stay only on the page while you use it, and they are not sent to a server.